Unable to Add Mobile Number to My Adobe Stock Contributor Account

Tried with VPN (Singapore and Netherland locations).

By @Tarun_kst

That does not help, as the issue is the country code, not the internet connection. You would need a mobile number from a different country, probably. I think, collecting all the information I learned about during the last weeks, that all numbers get blocked, where Adobe is not officially doing business. 

Before, there was no need to enter a phone number, so there was no issue with this, as a contributor. But as they have changed the rules to become a contributor, and new contributors now need to enter their phone number, this is an issue. 

I suppose that existing contributors are grandfathered, but new contributors are locked out, until Adobe changes this. I do not have any information that there is a change underway, and your only option is to check this with Adobe customer service. It's a customer service issue, as you need to enter your phone number with your Adobe ID and not with your contributor ID, if I'm correctly informed.

Confirm if there is an ongoing issue with adding mobile numbers for contributors in my region.

By @Tarun_kst

Yes, your region and some other select regions.

Manually add my mobile number to my account.

By @Tarun_kst

Nobody here can do that.

Mark my current device as trusted so that it does not ask for OTP every time.

By @Tarun_kst

That can't be done. If you are, however looking for a manner to sign in using a TFA, there are other means, like a second e-mail, or an authentification app. I use the app: "Adobe Account Access"

This is, btw, not Adobe support, and Adobe does not read the messages here or follow this forum. We are all fellow contributors here, trying to help other contributors. That's all.