extern users (shared a folder with in sharepoint) don't receive validation code in e-mail

%3CLINGO-SUB%20id%3D%22%5C%26quot%3Blingo-sub-3147374%5C%26quot%3B%22%20slang%3D%22%5C%26quot%3Ben-US%5C%26quot%3B%22%3Eextern%20users%20(shared%20a%20folder%20with%20in%20sharepoint)%20don't%20receive%20validation%20code%20in%20e-mail%26lt%3B%5C%2Flingo-sub%26gt%3B%3CLINGO-BODY%20id%3D%22%5C%26quot%3Blingo-body-3147374%5C%26quot%3B%22%20slang%3D%22%5C%26quot%3Ben-US%5C%26quot%3B%22%3E%3CP%3EI%20try%20to%20share%20a%20folder%20in%20Sharepoint%20with%20external%20users%20with%20e.g.%20a%20gmail-address.%20The%20wrote%20me%20they%20don't%20receive%20a%20verification%20code%20in%20their%20e-mail%20of%20spam-folders.%20Can%20someone%20help%20me%20out%3F%20That%20would%20be%20great%2C%20because%20it%20actually%20would%20be%20a%20great%20way%20to%20offer%20some%20collective%20workspace.%26nbsp%3B%26lt%3B%5C%2FP%26gt%3B%26lt%3B%5C%2Flingo-body%26gt%3B%3CLINGO-LABS%20id%3D%22%5C%26quot%3Blingo-labs-3147374%5C%26quot%3B%22%20slang%3D%22%5C%26quot%3Ben-US%5C%26quot%3B%22%3E%3CLINGO-LABEL%3ESharePoint%20Online%26lt%3B%5C%2Flingo-label%26gt%3B%3CLINGO-LABEL%3ESharePoint%20Server%26lt%3B%5C%2Flingo-label%26gt%3B%26lt%3B%5C%2Flingo-labs%26gt%3B%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E%3C%2FP%3E%3C%2FLINGO-BODY%3E%3C%2FLINGO-SUB%3E
Occasional Visitor

I try to share a folder in Sharepoint with external users with e.g. a gmail-address. The wrote me they don't receive a verification code in their e-mail of spam-folders. Can someone help me out? That would be great, because it actually would be a great way to offer some collective workspace. 

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