Problem sharing dashboard - You do not have access to this dashboard

I set up free Power BI account and sent invite to share my dashboard with 2 others inside same domain; they never received an email from Microsoft at all.  It seems that this is not the first of its kind.  Any solution found yet?

Are the second colleague uses the same domain name as yours or is his domain registered in the powerbi tenant..

These are few issues that I ran into and able to solve.  Sometimes the error message is not obvious.

• Email not received by the user - Check the email alias as they might have a non standard email with number or other parts at the end. When a dashboard is shared, the email address is not validated and no further error message is received.
• User does not have access to dashboard, gets a similar error message - Office 365 license is required.  If using PowerBI Pro content, it requires the appropriate license as well
• User cannot sign in - In my organization, every one has two aliases, only one of them is recognizable through Azure AD. So ask the user to enter to correct email address
• Can get to the DB but not see objects - Verify the access to the tabular model, possibly add them to one of existing roles. Also, try signing out and sign in.
• Cannot get to PowerBI site or error loading page - Verify the browser version and upgrade.