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Power Automate
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Power automate desktop custom header

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Posted on by CU25120734-0 2
I am having issues while passing the custom headers in the power automate desktop header start with x-mha-gateway-key: 2121212121. below is the error "Missing required header: X-mha-Gateway-Key" while using invoke web services
 
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Power Automate Desktop
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    trice602 Profile Picture
    trice602 15,905 Super User 2026 Season 1 on at
    Hi there!
     
    It's been awhile since you posted, I bet you resolved this already but going to provide for others to help them as well.
     
    Essentially this comes down to formatting.  Your custom header MUST be formatted exactly as showing, CAPTIAL X, Capital G, Capital K
     
    Missing required header: X-mha-Gateway-Key" while using invoke web services
     
    So try this please:  X-mha-Gateway-Key: 2121212121
     
     

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