I think it has more active players than it had in 2019 or 2020.
FFXIV has 24 million but it has a permanent free trial (until level 60 I believe) and released in 2013-2014.
TESO released in 2014-2015 and reached 10M in 2017 (19M now).
It’s not a breakout success like Sea of Thieves (20M in 3 years + was best launch for a Rare game despite the underwhelming reviews at launch) but it’s still a great comeback, especially when you consider the utterly disastrous launch of FO76 (I mean, the Metacritic on Xbox One was even in the red territory with 49/100).
That would have killed any game if it hadn’t the Fallout brand to carry it (see Anthem).
The TV show on Amazon could give a great boost depending of when it’s coming and if it delivers.
Although I’m sure that a new Fallout game would have a lot more traction or players. It’s very hard to fully recover from a terrible launch and bad reputation.