Hello there @giggles5426! Welcome to the forums
I'm sorry to hear that you've encountered issues with both "The Masters" and "Finding Fritjof." Thank you for taking the time to share your report with us.
As you've noticed, you won't be able to start "The Masters" until both the Relic and the Vessel of Souls arcs have been completed. This means you'll need to complete both "Malvigr" and "The Vault of the Ancients." As you're unable to progress in "Finding Fritjof," this will prevent you from completing "The Vault of the Ancients."
I would recommend checking out our dedicated Megathread for this quest, as we have shared some updates in there recently regarding the ongoing investigations into this quest. You can also keep an eye out within the News & Announcements forum for any future updates too.
Thanks!