Melcloud device not found


I am using the Melcloud app for Homey but when I try to connect my wifi adapter MAC-5671F-E1 the device is not found. My username and password from Melcloud are correct. I tried several times, but it keeps saying “timed out after 30000ms”. My Homey runs on sw 5.0.0-rc.21 and Melcloud app is V2.0.9

I saw a 2019 topic and there it was solved with a software adjustment.

Does someone know how to solve this?

thank you in advance!

Maybe v5 is the problem