I was having a similar problem - just seeing 'true' after going through the SP Initiated SAML sign on and completing Azure Auth sequence. My regular account was having this problem. My separate AD login I'll call evaadmin for this purpose - was logging in and mapping to meraki_write role just fine. I banged on this about 4 hours before turning to the forums and seeing this (and even opened a case with meraki). I have a completely SEPARATE Organization for a small air-gapped tenant that my regular account is also included in. I thought AHA - that is it. I will go delete my regular account from that one off Org we have and I'll be good to go. It got worse from there. I am now presented a "Server error" message and cannot login with any account. This is not good and I don't know how to find my support case if I can't login - rut roh!
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