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I am reviewing your question and will post back shortly.
Who is your email service provider? i.e Gmail, outlook etc.
Hi sorry for the delay, I was trying to add a yahoo account in my instance but it does not want to accept my pwrd.
A groupwise account however syncs well.
I wanted to recreate the issue and then try this suggestion: https://support.mozilla.org/en-US/questions/1026836
Please try it and advice if it works.