Hello Alvera. Sorry to hear you have a problem. If you could go to our <a href="https://wiki.roll20.net/Solving_Technical_Issues" rel="nofollow">https://wiki.roll20.net/Solving_Technical_Issues</a> wiki page and perform steps 1 thru 3 to see if they solve your problem. If not can you perform step 4 and post the results? Now to ask a question. 1: Did you boot anyone from the campaign recently? If so then it resets itself and you will need to resend any of the invites. If you sent new invites and they don't work, see step 4 when trying to send them again. Workaround: Did you ask them to post in your looking for players listing? If you did not then have them post there and you can click on an invite to campaign button in their post. That usually works 95% of the time. You may need to pm them the url to the listing if you do not have it enabled.