After several days of frustration I've pieced together a successful fix for the BoA migration issue.
If you receive the error message “Something went wrong”, or "Sign in to bank of America failed. Please try again."
Follow these steps at this URL link:
BUT ADD THE FOLLOWING STEP BETWEEN STEPS 3 & 4 IN THAT LINK...
After I revoked Quicken consent from the BoA website, exit then log back into the BoA website and when you see the 10 minute pop-up to "accept access to Quicken" deny access to Quicken. Go back to Quicken and now you can successfully authorize all your BoA accounts.
I was able to successfully authorize my checking, savings, credit card & loan accounts.