Project Plan 3 license not activated
I purchased a license for MS Project Plan 3, confirmation of purchase was received by email and the license is visible in my 'Microsoft 365 beheercentrum' .
But after downloading and installing the software a popup screen is shown indicating that I have a 5-day pass expiring after 5 days. To activate the software I need to give a product key which I do not have. The other option is 'download software' ??
What should I do to activate my Project license?
I also don't understand why my Office 365 subscription is not mentioned in my 'Microsoft 365 beheercentrum' although it is visible in my Microsoft account, but my Project license is not mentioned in my Microsoft account! ?
Please advise?