HomePod mini won't update. Saying "Could not Complete the operation." And intercom won't work from HomePod to phone...saying that there are no compatible devices.

Ahh, I see there are two “Sound Check” settings; I had changed the “Media” Sound Check setting found in the main “Homes” Home setting which appears to be a universal Sound Check setting but not sure. Anyway, There was a Sound Check setting in each speaker’s settings, under Music & Podcasts. I enabled that one and the update worked. I did also change the Siri “voice” (to Australian) because I read an old article (2018) that mentioned that also.

In the end though, I cannot help but think it was more just waiting for the HomePod mini to “settle-in” with Apple and fix itself…

Was having the same problem and this appeared to do the trick: enable sound check

[Link Edited by Moderator]

I also get “Could not complete operation” Enabling Sound Check does not help mine.