I've added the report " Sequence Performance" to my dashboard and I was able to see it,
however, starting from today am unable to view it as it's telling me that I don't have permission and I have to contact the account admin even though I am a super admin.
Could you please let us know if anything in your account was updated recently?
To be able to use sequences you are required to have the Sales Hub Professional, Enterprise seat. Meaning that if you are the superadmin you will still need to be required to have a paid seat to be able to use/view sequences.
Could you please share with us a screenshot of what is the message informed on your side? It will help us identify what could be happening, but from my understanding, you will also need a paid seat under your user ( Being superadmin will not allow you to access sequences since it's a paid feature).