Sonos system registered to old email after change

In the app, use the option Transfer System Ownership to register the devices to the new email address/password.

That does not work. As I mentioned the app thinks the current system on network is registered to someone else. I can start the transfer process, provide all the credentials and then it errors out with generic “problem occured"
 

Yes I know the devices are still registered to the old email address, hence the reason to ‘transfer ownership’.

Are you entering the new email address and password for the credentials when promoted?

If you’re saying the transfer process doesn’t work in the app, then contact Sonos Support. 

The Answer given by ​@Mr. T should have resolved your issue. Regarding the email….did the previous email belong to your finance or someone else? If the latter (and you can’t obtain those credentials) your only solution will be to factory reset all speakers.  If the former then contact Sonos Tech support as suggested.

We have the credentials, that's not the problem. She changed her account email, so we log on with the new email now (old one does not work). And yes, I'm entering her credentials first in transfer process and then mine - which errors out. I also tried entering her credentials twice, which succeeds but I still can't adjust any settings as app requires me to “sign in as system owner"

It belonged to my fiancee. She changed account email which is what broke system ownership in the app

OK...So the question remains how did she go about making the change? Did she follow option 1 or 2:

1. https://support.sonos.com/en-us/article/transfer-your-sonos-system-to-a-new-account
2. https://support.sonos.com/en-us/article/change-your-sonos-account-email-address

#2

Admittedly, I have only used the transfer ownership process with S1 app and not the new Sonos app, but the process was clear and straightforward.

The whole point of the transfer system ownership is because you don’t have the previous credentials.

I’m confused as to why you are entering your credentials during the transfer process, I thought you were looking to register the system under your fiancé’s new Sonos email address?

Plus, if you have your fiancé’s previous credentials, why aren’t you able to use them to sign into the app?

Actually, going back to this. You say the system is registered to someone else. This “someone else” not your fiancé’s old Sonos account?

If no devices are showing under her new Sonos account following the request to change email address, then I would be contacting Sonos Support as it doesn’t appear the process has been completed successfully.