I have now left my phone AP connected overnight to see in anything changes. I am experiencing the same issue as described here: https://community.viessmann.de/t5/Konnektivitaet/Backend-nicht-aktiv/td-p/390232 https://community.viessmann.de/t5/Konnektivitaet/WLAN-Verbindung-schlaegt-fehl-E12-Verbingund-zu-mgmt-viessmann/td-p/281801 Yet no solution at sight.
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