Standardnotes Sign in error

My YunoHost server

Hardware: Old computer
YunoHost version: 4.3.6.3
I have access to my server : Through SSH and through the webadmin
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no

I have trouble singin into Standard Notes. I have installed the standard notes webapp and the standard notes sync server. Both on there own domain (notes.domain.tld and stdserver.domain.tld). I can create an account using the webapp en loggin into it. But if i logout i am unable to log back in it wil show then the following error:

Screenshot 2022-06-22 150823

Is there someone that has encountered the same issue and know how to solve this?
Please let me know. Thank you!