Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
I use the Google SSO option and love it. But recently I inadvertantly created a new scout instead of transferring in an existing scout. When I realized the error I was unable to delete the scout because the delete action prompts for a password, which I no longer use.
This is a bug. I have duplicated this issue. I will notify the developers.
The workaround is to log in to my.scouting.org, click the down arrow next to the silhouette in the upper right corner and select My Account, scroll down and click BSA Credentials to switch Scoutbook to use a BSA ID and password. Delete the account in Scoutbook then go back to my.scouting.org and re-enable Google login.