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!Friendica Support
I tried to add FediTreffStuttgart" target="_blank" rel="noopener noreferrer">https://sueden.social/@FediTreffStuttgart but the reply in Friendica was

Not Found

Invalid contact.

#0 /var/www/freunde/src/Model/Contact.php(3304): Friendica\Model\Circle::addMember()
#1 /var/www/freunde/src/Module/Contact/Follow.php(192): Friendica\Model\Contact::createFromProbeForUser()
#2 /var/www/freunde/src/Module/Contact/Follow.php(69): Friendica\Module\Contact\Follow->process()
#3 /var/www/freunde/src/BaseModule.php(231): Friendica\Module\Contact\Follow->post()
#4 /var/www/freunde/src/App.php(595): Friendica\BaseModule->run()
#5 /var/www/freunde/src/App.php(190): Friendica\App->runFrontend()
#6 /var/www/freunde/index.php(22): Friendica\App->processRequest()
#7 {main}

Is this problem already fixed in the develop version or is it a problem with my server?

This is the callstack. The error message should have been above this.
@Marco R. Dev user here - I can confirm that I could follow @FediTreffStuttgart , so if you use Dev as well, it could be a problem with your server. Set your server logs to "info" level, attempt to follow the account again, set it back to "warning", and then send us any suspicious lines you find.