Android Dropbox Signin not working with some Internet browsers

Hi. I setup TB on PC and synced with Dropbox. Works, json file is there.

Now I installed TB on my Android 11 Phone and want to connect. But if I tab the cloud icon or the Signin menu the browser (Duckduckgo) opens a search instead of the Dropbox confirm page. I guess maybe it's because of spaces in the url. I read in  other threads that other browsers also don't work here.

In my case I had to set Firefox as the default browser on my phone. Firefox did the job.

Is there a possibility to enable this feature for all browsers?

best regards