Cannot update my phone number

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Click the following to contact Adobe customer support staff for help: 

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This is the link to the US website. If you are not in the US, the site should redirect to the page appropriate to the region associated with your ID.

Click the chat icon at the bottom right of the page to open a chat session. Typing AGENT into the chat window should connect you directly to a CSR rather than the AI.

If the CSR refers you to the forums, insist on speaking with a supervisor and keep moving up the chain until you get someone who knows what they are talking about.

You can also search this page for a regionally appropriate phone number for customer support.

https://helpx.adobe.com/contact/phone.html.

Be aware that because of the pandemic, wait times are far longer than usual due to reduced staff and higher demand. Please be patient with the people to whom you speak. Like you, they are feeling a great deal of stress. A little patience and understanding will go a long way to helping you in your particular situation.

for 2fa i believe mobiles are required.

otherwise your message is confusing.  you indicate in the first sentence you need a mobile and in the last sentence you need a non-mobile.  regardless of what you wrote, you need a mobile for 2fa.