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Please know that this isn't the type of service we want you to experience. May I know what are you trying to do before you receive the issue? so that I'm able to provide you with the best information.
However, the only to make screen sharing is by contacting our Customer Care team.
Also, if there are any accounting and bookkeeping features you haven't tried yet, these articles will come in handy: QuickBooks Online Help Articles.
Please let me know if you need anything else.