Azure for Students accounts are automatically validated by Microsoft and this message usually appears when the eligibility requirements are not met.
this reaseons you can see . that your email address is not associated with a verified educational institution. OR The student status could not be confirmed automatically. The account was previously created or attempted with incorrect or incomplete information. Regional or policy restrictions may also apply in some cases.
Unfortunately, community members cannot unblock or manually approve Azure for Students accounts. This process is handled only by Microsoft systems.
I recommend checking that you are using a valid school or university email address and reviewing the eligibility requirements on the official Azure for Students page. If everything seems correct, the best option is to contact Microsoft Support directly through the Azure portal or the official support channels for further assistance.