Same here, i wrote to Home-connect support. You can probably do the same i think is a data validation on their end which seems “odd”. Adding an URI/URL without “/” is not possible.
I’m having the very same issue.
Tried different browsers on different operating systems and different redirect URI’s.
No success at all. Have contacted support, so far no answer…
I’ve reached out to Support as well and haven’t received a response. Was excited to get this set up with new Bosch Dishwasher but obviously not right now.
this particular problem does not seem to be there any more as I could create a new application without problems. I am not personnally trying to use HA for the integration but to test the home connect API with POSTMAN. Unfortunately the authentication flow is failing without a clear explanation. Presumably, the HA integration goes through the same authentication workflow to get tokens, could someone confirm he could make it work recently or better yet help me trouble shoot my own test with Postman