That may be caused by the Bundle ID which is http://com.apple.ist .* so that the Apple signing server won’t allow you to do so. (SEED’s is http://com.ist.apple .*, so you could do that)
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I would say you could hardly do so. There might be some ways for certain normal apps, but for Apple internal apps which may include an authentication system, I guess you just simply can’t.
How come everyone else is able to sideload them then? There must be a way.