Calendar ID in create response differs from what Graph stores - microsoft-graph-api

Question

We are experiencing inconsistencies with calendar ID's.
When sending a POST to https://graph.mircrosoft.com/v1.0/me/calendars with the following payload
{ name: 'Calendar' }
We receive this reponse from which we store the id
{
:"#odata.context"=>"https://graph.microsoft.com/v1.0/$metadata#users('user%40outlook.com')/calendars/$entity",
:id=>"AQMkADAwATMwMAItMjE5ZC01YjYyLTAwAi0wMAoARgAAA1D6u4KwtRdMm1rAZoOEKvAHAMf0BP7S_89KmnrxCgze9tcAAAIBBgAAAMf0BP7S_89KmnrxCgze9tcAAAEBKdoAAAA=",
:name=>"Calendar",
:color=>"auto",
:changeKey=>"x/QE/tL7z0qaevEKDN721wAAAAAOFQ==",
:canShare=>true,
:canViewPrivateItems=>true,
:canEdit=>true,
:owner=>{:name=>"User", :address=>"user#outlook.com"}
}
When we attempt to create events into this calendar errors are being thrown as that ID does not exist. Looking into it further and making a GET request to https://graph.mircrosoft.com/v1.0/me/calendars we receive this payload (truncated for brevity)
{
:id=>"AQMkADAwATMwMAItMjE5ZC01YjYyLTAwAi0wMAoARgAAA1D6u4KwtRdMm1rAZoOEKvAHAMf0BP7S_89KmnrxCgze9tcAAAIBBgAAAMf0BP7S_89KmnrxCgze9tcAAAIjxAAAAA==",
:name=>"Calendar",
:color=>"auto",
:changeKey=>"I8E7t/aNjEqDHtJJL1UC6AAADFI=",
:canShare=>true,
:canViewPrivateItems=>true,
:canEdit=>true,
:owner=>{:name=>"User", :address=>"user#outlook.com"}}]
}
After diffing both ID's, we notice they differ. The interesting part of this is that this only happens with a handful of users and isn't an issue with most accounts. Is there a better way to keep track of specific calendars that we can continue to sync into? I'd hate to have to ping for calendars every time we'd like to fire off a CRUD action.