Alexa doesn't recognize my Premium family membership

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Trying to get Alexa to recognize that my Spotify account on my Echo Dot is part of a  premium family plan set up by my daughter. I can login to Spotify on my laptop just fine, using the credentials her invite provided (some waaaaay long user name, what's up with THAT?? 🙂 and it correctly shows me as a family member. However, when I try to add Spotify to Alexa via the Alexa settings, I click on Music, am prompted to enter Spotify credentials (which are actually saved in the Alexa Spotify screen that comes up there). I get the Spotify auth options, which don't appear to be waiting for input from me. It says I'm logged in as Elaine, and I click on Agree. I see 3 horizontal "dots", and it consistently just bounces back to the main Alexa screen without connecting or any other messages.

I have tried this multiple times, but it never works. I've reported this to Spotify, but so far no response. I'd also had a similar problem with Alexa not recognizing my gmail calendar, and now with this, it sure seems like Alexa is the issue here. It ain't exactly brain surgery 🙂 Thoughts?

TIA

Premium Family Plan, USA, Samsung Galaxy S8, Android Oreo, Echo Dot 3rd Gen, Alexa app version 2.2.250163.0

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Forgot to add that as mentioned in my original msg, I can get into Spotify on my laptop just fine with the Premium Family account credentials and it shows that, but I can NOT enter Spotify by itself on my phone with the exact credentials. It lets me in, but not as a premium family member, presumably as a free member? No messages shown either.

Elaine