Same problem here, cannot access to my apps, there are the following Javascript errors on the homepage of iTunes Connect:
Uncaught TypeError: document.getElementById(...) is null
setCopyrightYear https://itunesconnect.apple.com/itc/js/gettingstarted.914c08a049.js:67
https://itunesconnect.apple.com/itc/js/gettingstarted.914c08a049.js:96
gettingstarted.914c08a049.js:67:68
XHRGEThttps://itunesconnect.apple.com/WebObjects/iTunesConnect.woa/ra/l10n[HTTP/1.1 401 Unauthorized 339ms]
Uncaught (in promise) TypeError: sessionMenu is null
loadUserDetail https://itunesconnect.apple.com/itc/js/gettingstarted.914c08a049.js:57
promise callback*loadUserDetail https://itunesconnect.apple.com/itc/js/gettingstarted.914c08a049.js:35
https://itunesconnect.apple.com/itc/js/gettingstarted.914c08a049.js:95
gettingstarted.914c08a049.js:57:4
Uncaught (in promise) TypeError: locObject is undefined
replaceLocalizedText https://itunesconnect.apple.com/itc/js/gettingstarted.914c08a049.js:8
replaceLocalizedText https://itunesconnect.apple.com/itc/js/gettingstarted.914c08a049.js:6
loadLocalization https://itunesconnect.apple.com/itc/js/gettingstarted.914c08a049.js:25
promise callback*loadLocalization https://itunesconnect.apple.com/itc/js/gettingstarted.914c08a049.js:24
https://itunesconnect.apple.com/itc/js/gettingstarted.914c08a049.js:94
When is it going to be fixed??