Thanks again for your help.
The export migration has just finished, and the photo I tried to send by Murena email yesterday as a test has suddenly arrived.
Before the export migration completed, I double-clicked on an “Authentication failed” warning, and instead of getting the ZIP archive with debug info, I got an “Outgoing Server Settings” page that allowed me to check my password. It was the old password that I updated last Wednesday, and I received an email confirmation of this last Wed, but for some reason the update has not been recognised on my phone. It works on the Murena Cloud, but not on my phone.
I therefore updated the password on this Outgoing Server Settings page, but after I restarted my phone, the “Authentication Failed” message appeared again. I was once again shown the Outgoing Server Settings page, and it still had the old password.
When I updated it again and then restarted, I got another “Authentication Failed” message, and this time it was back to the it to the ZIP archive with debug info. At least I am now able to read the debug attachment, as it has been successfully emailed to my computer, but it makes no sense to me.
The password works on my desktop murena.io account, so I don’t understand why it doesn’t work on my phone, or how I can update it.
Also, on the Murena Cloud, my old Google photos have now been imported, but I still can’t get the photos I took at the weekend using my phone to transfer to the Murena Cloud.
Similarly I can’t get my contact list to appear on my phone, even though it’s migrated into the Cloud.
And I can’t get my gmail emails to appear either on my phone or in the Cloud. When I went to Settings - System - microG I got a message saying “This account already exists on your device”.
I did just notice that I don’t seem to have the latest /e/OS update from July 24th. I’m reluctant to click Apply Update, in case it just leads to more problems.