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nothing to do with credentials, and there's no way you could have tested this without actually deploying V3. MS' proxy is going to contact whatever IdP it's told to contact, there's no way to control that locally in a controlled way.</span></div>
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<div class="">There are many upgrades that have used a dedicated testing domain.</div>
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<div class="">Sorry for giving the precise wrong advice out again. Shrug. I can copy and paste what others used if I use the format that they're using.</div>
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<div class="">How compatibility flags or overlapping formats were supposed to work never clicked in my head and I had little interest in iteratively breaking things when I had a chance to break everything at one time.</div>
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