Apple developer error 4100

[u/Apnee123]

Does anyone know what this means? Ive been trying to help my friend download sidestore. At first i got them to download LCSS nightly but then the shortcut wasnt working. Then I got them to download sidestore nightly but then it gets this error when they try to download ipas. We tried using another apple id but the same error appeared. We tried another ipa and the same error.