Hello R.D.W   You have about 6+ timelines across all your worlds. The limit for free timelines is 2, which is probably the reason you cannot create another.

Katerina can we please investigate and confirm this?

Hey, R.D.W as described above it is because you are over the free limit of timelines, however you should be getting an error message explaining this when creating a new timeline. If that's not the case, could you describe your steps and what happens?

Hey there, I am closing this report since there has been no response in more than 7 days. Please feel free to respond here with any updates so we can continue investigating!