You'll probably need to provide a bit of context here.
What exactly are you trying to do and what steps did you go through to you end up at this page?
Are you sure that you're on the genuine myAccount site?
I just logged into my own myAccount and it went fine.
For what it's worth the phone number in the screenshot is the correct one for the myAccount helpdesk.
When did they say this to you?
Perhaps they simply haven't done that yet?
You should probably give them a call tomorrow to check the status of your registration for myAccount.
Note that the helpline only operates for a half day.
Phone
01 738 3691
Telephone opening hours: 09.30 to 13.30 (Monday to Friday).