what do these d4 error codes refer to
FB396CC4-6267-4A01-978E-FB11D8CFBB93
3C23E1CE-B04E-423F-9904-0CB7A6F8AC54
7442AF58-5C63-4DE3-8E1B-85F63EB7219E
Those are Crash Report IDs, and you can quote them if you file a support ticket with Blizzard and/or post in their Technical Support forums, and they can look up the details of your crashes in their database using those IDs.
Having said that, this forum is for giving Feedback about Blizzard’s support website, so you won’t get anywhere reporting technical issues about Diablo IV here. So…
A simple search…
https://www.google.co.uk/search?q=diablo+iv+forums
The very first link returned…
Alternatively…
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