What do you do if you have sent an invitation to a project member, and the invitation never gets received in the person's e-mail inbox?
You can do the following steps to send out a new invitation manually:
Open the project you have invited that person to
Then, click on the 'People' tab.
Find the person under pending invitations and click on the 3-dot icon
Click on 'Copy invitation link'
Then click on ctrl/command and v simultaneously to paste the copied link, e.g. in an e-mail you are going to send.
You can also copy the link manually by marking the text inside the brackets and copy it.