Change my console preview not working

So I am on the omega preview and I wanted to change it to the beta preview so I go to in the insiders app and then it shows this pop up that says “error this preview is registered to a different gamer tag please you sign in with the account use to enroll or go to settings and remove this device from all previous so you can re-register the device in to one or more previews with your gamer tag” there is no other account on my Xbox and there never has been but I did change my gamertag a few months ago. Is that something that could make that not switch over? If so how can I fix that? I’ve deleted my account on my Xbox and factory set it and everything and still shows this.

submitted by /u/lilbinkiiee420
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