show availability from multi accounts

Occasional Visitor
Consider this example ... I am a Project A person who is working 25% on Company 1, 75% on other clients. I need to make my Company 1 meetings visible in my Project A calendar so people don't double book me when it looks like I'm free.
I have 2 different O365 accounts ( me@Projec A@A.ca and me@Copany1.ca ) 
How do we manage this scenario? Is there a way to show overlap view of all my calendar accounts to other people in Outlook? 
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