AADSTS5000228: Access to newly created tenant is denied.

Hi.
I wanted to activate P2 trial for my existing Azure account. However, following the process I believe Azure did not allow to activate the free trial on my existing account and created a new account (with ID ******@domain.onmicrosoft.com).

After I entered all details required (including credit card information) I got a confirmation that the account was created.

But when I try to login, I get the error "AADSTS5000228: Access to 'xxxxxx' tenant is denied. Please contact your administrator."

I saw on another post that I should call MS support to open a case. But isn't there an easier way than explaining all through the phone? I should be able to open a help request on my existing free pay as you go tenant for this using Billing or subscription management selections according to MS documentation. But no matter what I select, I never reach the screen to open a request and get only default "solutions" that are useless. Is that expected?

I need to know two things:

Was this new azure tenant really created? If so it will bill me in one month. So, I need to access it to use the service or cancel it.

What is the easiest way to get access to this newly created tenant? (no calling support preferably?)

Thanks.