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My suggestion (but need to be tested 1st)
You can invite them to use your instance from their Mobile - Jive Daily allows you to connect into Jive and to follow all the news.
1 / Create for them an email address (Gmail can be an alternative)
2 / Use the External access feature to invite them into your internal community.
Thank you for your feedback.
I forgot to mention one limitation : we are not allowed to use personal device in our factories.
We consider setting up shared computers to give access to Jive.