@Shawzborne, who did you speak with @ Apple and what did they say? Has anyone else reached out? Judging by the relative lack of mentions online, doesn't seem widespread... According to the coinciding console logs, it seems it may be some sort of authentication bug: error 03:28:57.510123+0300 TestFlight AMSAbsinthe: [3822C21C] No bag provided. Defaulting to skipping Absinthe signing. error 03:28:58.114276+0300 TestFlight RP(0x282845a60) URL=https://testflight.apple.com/v1/session/authenticate; code=400; Headers={ Connection = close; "Content-Length" = 169; "Content-Type" = "application/json;charset=utf-8"; Date = "Sat, 22 Apr 2023 00:28:58 GMT"; Server = "daiquiri/3.0.0"; "Set-Cookie" = "dc=mr;Version=1;Domain=.itunes.apple.com;Path=/;Max-Age=86400"; "Strict-Transport-Security" = "max-age=31536000; includeSubDomains; preload"; "X-Apple-Jingle-Correlation-Key" = OUO35BHL6WPDECX6AWAY7S5KRE; "X-Content-Security-Policy" = "script-src 'self' *.apple.com"; "X-Content-Type-Options" = nosniff; "X-XSS-Protection" = "1; mode=block"; "x-daiquiri-instance" = "daiquiri:15751003:mr36p00it-hyhk06054801:7987:23RELEASE49:daiquiri-amp-dsce-asc-int-002-mr, daiquiri:18493001:mr85p00it-hyhk03154801:7987:23RELEASE49:daiquiri-amp-all-shared-ext-001-mr"; "x-frame-options" = DENY; } error 03:28:58.116508+0300 TestFlight Authentication failed: Device vendor ID is missing or not available. Try again. error 03:28:58.200037+0300 TestFlight tcp_input [C4.1.1:3] flags=[R] seq=2699034455, ack=0, win=0 state=LAST_ACK rcv_nxt=2699034455, snd_una=3121551701 I have no idea what AMSAbsinthe is... If the issue persists I'll contact Apple as well.

Same here. iPhone 12 Pro Max iOS 16.4.1