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It would be helpful if you gave a little more context with a use case. This document might be helpful: https://documentation.meraki.com/General_Administration/Cross-Platform_Content/Blocking_and_Allowing_ClientsAlong with this one: https://documentat...
As a workaround you can use the GET call to retrieve an accounts ID. But as mentioned before I would engage support as to why your getting a 201 with a null body.
I would do a screen share with support and show them exactly what you were clicking. However it sounds to me as you were under the network-wide>general page to schedule the upgrade and then changing to ignore. I would recommend using the organization...
https://documentation.meraki.com/MI/MI_WAN_Health/MI_WAN_Health_Overview#OfflineWhat do your pings to 8.8.8.8 / other configured monitoring Ip's look like?