You still didn't get it, did you?
The How-to says:
So, with every error report we need at least:

a step-by-step description of what you did and/or screenshot to help us reproducing your problem
the URL of your site
the operating system/version of your device
the brand/version of your browser

This time, the browser plays the important part. And you didn't name it. Choosing a mobile device in Firefox is working fine. Using Chrome gives trouble. But I'll stop here because I don't want to disturb Arsalan's component with a useless discussion like this. Just don't wonder if future reports of yours may be ignored.

I DID give you these information:

When you activate dev tools and toggle the device toolbar with
CTRL+Shift+M and chose a mobile device like iPhone or Samsung, then
you get a console log error

Yes, I did not use the phrase "User agent", but

"chose a mobile device like iPhone or Samsung"

should make it clear tho too

Just tried again:
1. as before using Firefox on Linux: no issue, getting 200 response
2. now using Chrome on Linux: same issue as you: getting 401 response

And I can only ask again: Why don't you accept the guidelines of How to report bug and provide the COMPLETE details right from the beginning? We don't want them just for fun, we need them because they indeed can make a difference. This time it's obviously the user-agent. And Ossn isn't involved at all.

So please report your issue to Google, as others already did:
https://github.com/google/recaptcha/issues/561

The captcha is showing, that is not the problem, I am only referring to the console log entry

I thought maybe it needs some update

I see cpatcha when visiting your website. Are you using more than one recaptcha components example 1 and 2?

I still see it

It is important that you activate mobile user agent via developer tools

Found no issues at https://queermeet.de/

Why don't you provide the details of your problem site as requested in How to report a bug?

When you activate dev tools and toggle the device toolbar with CTRL+Shift+M and chose a mobile device like iPhone or Samsung, then you get a console log error

Could you please check that?

now it seems to work, thank you!

Try 7.4 yes sorry there was problem in zip archive.