Security stupidity
You can't tell idiots afflicted with Security Stupidity anything because the answer will only be "Oh, that's uh, you know, Security - it's required to not work like a 12 yr old wrote it for us. We know, you just don't understand..."
But I do. And it's not. So when you have problems with their messed up security be prepared to sign-out and back in, and delete and re-load the app. Possibly a couple times. Personally, I recommend setting up all users via web first. Either way, it will work eventually, and pretty well, after you get past their multiple initial validation sync issues.
Response from developer
Thanks for your detailed review, Vardelda. Weβre sorry to hear about your frustration with the appβs security features and repeated sign-in requirements. If you'd like to share more details or need assistance, please email us at socialmedia@gm.com with "ATTN: myBuick APP/vardelda" in the subject line. Weβre here to help. ~Pat