Small note :

Here, ae0984fa-0629-410a-8289-81277f833f09 is the UUID of an arrow.
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The problem :

When using this command in a command block :

/tp @p[team=] ae0984fa-0629-410a-8289-81277f833f09

there this error message :
The entity UUID provided is in an invalid format

But when using this command

/tp @p[team=Blue] ae0984fa-0629-410a-8289-81277f833f09

its working.
I can only assume that the problem is not the UUID format but the attribute @p[team=].