Attendees unable to join Teams Meetings

%3CLINGO-SUB%20id%3D%22lingo-sub-1235097%22%20slang%3D%22en-US%22%3EAttendees%20unable%20to%20join%20Teams%20Meetings%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-1235097%22%20slang%3D%22en-US%22%3E%3CP%3EI%20had%20a%20meeting%20and%20external%20attendees%20who%20were%20sent%20the%20invitation%20got%20the%20following%20response%3A%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EUnable%20to%20open%20the%20helper%20application...Meeting_xyblahblah.....%3C%2FP%3E%3CP%3EThe%20protocol%20specified%20in%20the%20address%20is%20not%20valid.%3C%2FP%3E%3CP%3EMake%20sure%20the%20address%20is%20correct%20and%20try%20again.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EHas%20anyone%20had%20the%20same%20issue%20and%20what%20is%20the%20fix%3F%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-1235097%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3Ejoin%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3ETeams%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3Eunable%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E%3CLINGO-SUB%20id%3D%22lingo-sub-1291351%22%20slang%3D%22en-US%22%3ERe%3A%20Attendees%20unable%20to%20join%20Teams%20Meetings%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-1291351%22%20slang%3D%22en-US%22%3E%3CP%3EI%20am%20getting%20the%20exact%20same%20thing%2C%20only%20some%20of%20my%20guests%20can%20join%20while%20others%20get%20the%20same%20error%20you%20do.%20Any%20suggestions%20or%20help%20from%20any%20one%3F%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-SUB%20id%3D%22lingo-sub-1403416%22%20slang%3D%22en-US%22%3ERe%3A%20Attendees%20unable%20to%20join%20Teams%20Meetings%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-1403416%22%20slang%3D%22en-US%22%3E%3CP%3E%3CA%20href%3D%22https%3A%2F%2Ftechcommunity.microsoft.com%2Ft5%2Fuser%2Fviewprofilepage%2Fuser-id%2F585445%22%20target%3D%22_blank%22%3E%40Duffy782%3C%2FA%3E%26nbsp%3B%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EAre%20the%20users%20that%20are%20joining%20on%20IOS%20or%20using%20Safari%3F%20IOS%20devices%20will%20need%20to%20download%20the%20teams%20app%20in-order%20to%20use%20the%20link.%20As%20for%20safari%20I%20would%20recommend%20using%20chrome%20or%20edge%20instead.%3C%2FP%3E%3C%2FLINGO-BODY%3E
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Occasional Visitor

I had a meeting and external attendees who were sent the invitation got the following response:

 

Unable to open the helper application...Meeting_xyblahblah.....

The protocol specified in the address is not valid.

Make sure the address is correct and try again.

 

Has anyone had the same issue and what is the fix?

2 Replies
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I am getting the exact same thing, only some of my guests can join while others get the same error you do. Any suggestions or help from any one?

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@Duffy782 

 

Are the users that are joining on IOS or using Safari? IOS devices will need to download the teams app in-order to use the link. As for safari I would recommend using chrome or edge instead.