Office 365 shows error on iPhone

Hi there,
When I try to connect and activate my account on Office 365 to my iPhone this error with No Subscription Found appears. Recently I bought Office 365 with a license and I think I have activated my account. Can anyone help me to fix this problem ? Is there a chance that I might be lost my license cause of a mistake ?
Thanks !

No Subscription Found
We couldn’t find a subscription connected to your account.
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