License activate problem

I activated debug mode but it didn't keep any error logs

[12-Nov-2022 18:43:32 UTC] PHP Deprecated: Return type of Requests_Cookie_Jar::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Cookie/Jar.php on line 63
[12-Nov-2022 18:43:32 UTC] PHP Deprecated: Return type of Requests_Cookie_Jar::offsetGet($key) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Cookie/Jar.php on line 73
[12-Nov-2022 18:43:32 UTC] PHP Deprecated: Return type of Requests_Cookie_Jar::offsetSet($key, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Cookie/Jar.php on line 89
[12-Nov-2022 18:43:32 UTC] PHP Deprecated: Return type of Requests_Cookie_Jar::offsetUnset($key) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Cookie/Jar.php on line 102
[12-Nov-2022 18:43:32 UTC] PHP Deprecated: Return type of Requests_Cookie_Jar::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Cookie/Jar.php on line 111
[12-Nov-2022 18:43:32 UTC] PHP Deprecated: Return type of Requests_Utility_CaseInsensitiveDictionary::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Utility/CaseInsensitiveDictionary.php on line 40
[12-Nov-2022 18:43:32 UTC] PHP Deprecated: Return type of Requests_Utility_CaseInsensitiveDictionary::offsetGet($key) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Utility/CaseInsensitiveDictionary.php on line 51
[12-Nov-2022 18:43:32 UTC] PHP Deprecated: Return type of Requests_Utility_CaseInsensitiveDictionary::offsetSet($key, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Utility/CaseInsensitiveDictionary.php on line 68
[12-Nov-2022 18:43:32 UTC] PHP Deprecated: Return type of Requests_Utility_CaseInsensitiveDictionary::offsetUnset($key) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Utility/CaseInsensitiveDictionary.php on line 82
[12-Nov-2022 18:43:32 UTC] PHP Deprecated: Return type of Requests_Utility_CaseInsensitiveDictionary::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Utility/CaseInsensitiveDictionary.php on line 91

[12-Nov-2022 18:45:05 UTC] PHP Deprecated: Return type of Requests_Utility_CaseInsensitiveDictionary::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Utility/CaseInsensitiveDictionary.php on line 40
[12-Nov-2022 18:45:05 UTC] PHP Deprecated: Return type of Requests_Utility_CaseInsensitiveDictionary::offsetGet($key) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Utility/CaseInsensitiveDictionary.php on line 51
[12-Nov-2022 18:45:05 UTC] PHP Deprecated: Return type of Requests_Utility_CaseInsensitiveDictionary::offsetSet($key, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Utility/CaseInsensitiveDictionary.php on line 68
[12-Nov-2022 18:45:05 UTC] PHP Deprecated: Return type of Requests_Utility_CaseInsensitiveDictionary::offsetUnset($key) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Utility/CaseInsensitiveDictionary.php on line 82
[12-Nov-2022 18:45:05 UTC] PHP Deprecated: Return type of Requests_Utility_CaseInsensitiveDictionary::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Utility/CaseInsensitiveDictionary.php on line 91
[12-Nov-2022 18:45:06 UTC] PHP Warning: Cannot modify header information - headers already sent by (output started at /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Cookie/Jar.php:15) in /home2/kd126215/neu.mainmedia.eu/wp-admin/includes/misc.php on line 1416
[12-Nov-2022 18:45:06 UTC] PHP Warning: Cannot modify header information - headers already sent by (output started at /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Cookie/Jar.php:15) in /home2/kd126215/neu.mainmedia.eu/wp-includes/functions.php on line 6865
[12-Nov-2022 18:45:06 UTC] PHP Warning: Cannot modify header information - headers already sent by (output started at /home2/kd126215/neu.mainmedia.eu/wp-includes/Requests/Cookie/Jar.php:15) in /home2/kd126215/neu.mainmedia.eu/wp-admin/admin-header.php on line 9

Hi there,

can you disable Cloudflare and check if it works then ?

I already tried this, problem not solved

Go to Tools > Site Health, are there any issues reported there ?