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I will answer you in English based on your previous message. As a friendly suggestion, posting in Norwegian may help your question reach a wider audience and increase the chances of receiving assistance from other community members.
I understand that you want to set your existing alias as the primary one, but selecting Make primary keeps returning an error even though the alias is already listed under Manage how you sign in.
Could you confirm whether the alias shows as verified? Also, did you recently add it or make any changes to your account’s security information?
As a quick browser-session check, please open an InPrivate or Incognito window, sign in to your account and try selecting Make primary again. If possible, please also test another browser or device.
For now, please do not remove either alias, as removing an alias may permanently delete the address.
Please note that this is a user-to-user support forum. Moderators and contributors, including external employees, cannot directly modify product features or access back-end account systems. Our role is limited to providing technical guidance for reported issues, requests and ideas.
If the same error continues across different browsers and devices, the alias change will likely require an account-level review through the appropriate support channel.
Please let me know what happens after trying these checks.