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Is a user certificate being supplied for Kerberos Auth? FAS or something similar? Workaround if its a bit problem would be use machine account identities to access the storage.

yeah it is using FAS, think that error might be a red herring and more of a symptom of a bigger problem - mr @Toby Browne is working through it

I'm interested if seeing what happens here.

I’ll definitely keep the thread updated @Leee Jeffries.