the router was brand new! ""The router is managed by others" appear only at the end of the failed adoption otherwise the router works regulary as stand alone

@Vincent-TP I can confirm that every time I tried the router was succefuly resetted and I tried almost 10 time... And every time the result is always the same, on the controller side "Adopted failed"...

@Vincent-TP I started the setup after factory resetting the router and followed exactly everything in the document you provided. I've tried it several times, but the result has always been the same....

Omada configuration. Controller is local OC220 (IP address 172.16.0.10/19). Want to replace a "old" ER7206 with a "new" ER707-M2. Network is 172.16.0.0/19, router should have 172.16.0.1 as its own IP...