Hey there, iny x
When no one has signed into your tenant for a pro-longed period of time, the system marks the tenant as inactive. This happens around 200 days of inactivity. Once this happens, you have 20 days, from when the tenant was first marked as inactive, to reach out to Microsoft business support to ask them to reactivate your tenant.
If you are within the 20 day window, please reach out to Microsoft business support using the phone number for your region from the list here: https://support.microsoft.com/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2
When you reach out, you will be greeted by the AI bot. This bot will want to collect information about why you are calling. Please speak clearly to the bot. I would say 'Azure tenant locked out due to inactivity'
This will allow the bot to transfer you to the right team who can handle this for you.
If you are over the 20 day window, then your data and resources on the tenant are deleted as per Microsoft's data protection policies. You can find out more here: https://www.microsoft.com/trust-center/privacy/data-management#leave
Once past the 20 day window, the tenant can't be recovered and data deleted can not be restored. Instead, you will need to create a new tenant by signing up for Azure again using this link: https://azure.microsoft.com/en-us/pricing/purchase-options/azure-account
Hope this helps,
Nathan