Have the same problem, UE 5.3, windows 11
I did sign in eventually, I first did my chrome as default browser, then i loggen in on browser first with my epic account and then i logged in on my UE 5.6.1 interface inside the UE 5.6.1 and it worked. Thanks
Same issue
Pretty strange but this did fix it for me. Change project name to 4 characters and it is resolved Fab login. Does not resolved Meta human connection issues in windows 11 though.
same issue, but I found a solution. Firstly delete the folder ‘webcache_4430’,which is located in your UE project(Example Path E:\UE5_Project\project_02\Saved\webcache_4430), then copy the same folder from any project that you cloud log into the Fab (from old version like 5.4), then replace it. The problem is Webcahe folder. Hopefully its helpful.
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EMP-19798 has been added to our ‘To Do’ list. Someone’s been assigned this task.
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As another user said, it only works with Chrome as default navigator. No luck with Firefox, specially if you were signed on wrong account and try to change.
I had the same problem.
I tried to change the logged-in account, but it got stuck in an infinite loading loop. After closing the project and deleting the WebCache folder, I was able to log in successfully again.
Savez-vous si le problème à été réglé depuis ? impossible également de se connecter a fab depuis UE c’est très génant…
Same problem - May 12 2026. WIN 11 Tried setting both Chrome and Edge as the default browsers, logged in to FAB on both and into Unreal via the launcher, deleted the webcache folder, rebooted the machine - nothing works. Paid assets not able to be used.