Change email address for Trados Enterprise

I bought Trados 2021 and my account is linked to my old GMX email address. I am now only using a GMAIL account, but my licence is still linked to my GMX account, as I don't seem to be able to change this. This prevents me from accessing jobs in Trados Enterprise. I need to completely delete the GMX email from my SDL/RWS account and use only the GMAIL one. How can I change the email address?

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