Same issue here as obakuhl - on Firefox, regardless of version, the Windows Admin Center gets stuck at "Gathering environment info—this may take a few moments...". Several errors in the console:
Cookie “XSRF-TOKEN” has been rejected for invalid domain. 2 <server hostname>.<domain>.local
Welcome to the Windows Admin Center debugging api. Type "MsftSme.help()" to see a list of available commands main.c65ecd813ed83fed7771.js:1:69745
Ignoring unsupported entryTypes: longtask. msftsme.core.3477e099f1994f4ea0fa.js:1:380450
Cookie “XSRF-TOKEN” has been rejected for invalid domain. 4 manifest.json
XML Parsing Error: not well-formed
Location: https://<server hostname>.<domain>.local/manifest.json
Line Number 1, Column 1: manifest.json:1:1
ERROR Error: Uncaught (in promise): TypeError: items is undefined
canActivate@https://<server hostname>.<domain>.local/19.c34c239d4b23fcc3e5c6.js:1:201583
sEIs/setupNavigations/rn</</</</s</<@https://<server hostname>.<domain>.local/vendor.angular.531f041ed66c890d22ca.js:1594:3276
i9xl/s/<@https://<server hostname>.<domain>.local/vendor.rxjs.c384f19b0681895f0df4.js:1:152444
_trySubscribe@https://<server hostname>.<domain>.local/vendor.rxjs.c384f19b0681895f0df4.js:1:85296
subscribe@https://<server hostname>.<domain>.local/vendor.rxjs.c384f19b0681895f0df4.js:1:85104
call@https://<server hostname>.<domain>.local/vendor.rxjs.c384f19b0681895f0df4.js:1:87147
subscribe@https://<server hostname>.<domain>.local/vendor.rxjs.c384f19b0681895f0df4.js:1:84982
s@https://<server hostname>.<domain>.local/vendor.rxjs.c384f19b0681895f0df4.js:1:162440
_innerSub@https://<server hostname>.<domain>.local/vendor.rxjs.c384f19b0681895f0df4.js:1:137601
_tryNext@https://<server hostname>.<domain>.local/vendor.rxjs.c384f19b0681895f0df4.js:1:137494
_next@https://<server hostname>.<domain>.local/vendor.rxjs.c384f19b0681895f0d…
Angular 19
r https://<server hostname>.<domain>.local/runtime.303e4f280a794e1c23a7.js:1
<anonymous> https://<server hostname>.<domain>.local/37.49801bc54d775413f36e.js:1
No problems accessing it through Chrome. I primarily use Firefox and avoid Chrome like the plague - I do not want to change this, so if anyone knows a fix, please let me know.
Thanks!