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Try clicking the share button on the top right of the google sheet and seeing if the email that you are authenticating with is listed. If not, try adding it. It could be that the permissions are set so that someone with the link can access it, but I think that the sheet needs to have the specific email address entered in the share window.
Pretty old thread here, but I'll reply just in case others come here with the same issue. When I encountered this it was because the sheet I was looking for had not been modified recently. I opened the sheet, made a minor change (like adding a new tab) and then the sheet appeared in Alteryx.