Maintenance for the week of October 13:
• PC/Mac: No maintenance – October 13
• NA megaservers for maintenance – October 15, 4:00AM EDT (8:00 UTC) - 12:00PM EDT (16:00 UTC)
• EU megaservers for maintenance – October 15, 8:00 UTC (4:00AM EDT) - 16:00 UTC (12:00PM EDT)
• ESO Store and Account System for maintenance – October 15, 4:00AM EDT (8:00 UTC) - 12:00PM EDT (16:00 UTC)
• https://forums.elderscrollsonline.com/en/discussion/683901
Good luck. If I remember past cases, you will have to try to work with Customer Support to take over the guild. That will not be an easy process. It might be easier to simply start a new guild and woo over the people from the old guild.