Login not possible with WordPress 5.7

Hi there,

i’m not 100% that this is caused by WordPress 5.7..
Since the Update to WordPress 5.7 I can’t login to my staging site.
I already tried to delete it and set up a new one – same issue.
Evertytime after the login it redirects to to login screen again, even I login to /staging/wp-admin.
If I use “Disable admin authorization” it will result in the same issue.

Do you have any ideas what I could try to login to my staging site?

Kind regards,
Kai