Sometimes there can be issues with participants' login links.
Here are a few tips on how to overcome them!
Try sending the login link again - maybe the first link directs the participant to a wrong page or is not valid due to changes inside the workspace.
Make sure the participant can access the page - sometimes pages are hidden or restricted and this prevents participant from viewing the page.
Advice the participant to copy and paste the link from the email. Sometimes the link is divided between lines of text and thus malfunctions.
Ask the participant to check their trash mail folder. The email might have arrived, but ended up in the wrong folder.
Contact Howspace support. If nothing else helps, contact support and we can investigate.