Okay, I figured this out, should have read the documentation!   I was using the wrong verb on the Synology group command, should have been 'addmember', not 'add'.   I've now added the temp account to the administrators group and disabled 2FA   Having now booted up and logged in, it looks like the reason it was failing may be something to do with two of my four HDDs being missing. Looks like I have satamap problems
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