XDR Display not working after OS update to 15.0, Sequoia

I am using an Apple Thunderbolt display for main display and keep the laptop closed during normal in office operation. I updated to OS15 and the first time I disconnected (today) the display failed to operate. The LED seems to be on since I can change the display settings and the screen changes light output, but no data. Any ideas?

Display Information:

Apple M1 Max:

  Chipset Model:             Apple M1 Max

  Type:  GPU

  Bus:    Built-In

  Total Number of Cores:          32

  Vendor:              Apple (0x106b)

  Metal Support:             Metal 3

  Displays:

Thunderbolt Display:

  Resolution:    2560 x 1440 (QHD/WQHD - Wide Quad High Definition)

  UI Looks like:                  2560 x 1440 @ 60.00Hz

  Main Display:                 Yes

  Mirror:                 Off

  Online:               Yes

  Rotation:          Supported

  Automatically Adjust Brightness:    Yes

Color LCD:

  Display Type:                  Built-in Liquid Retina XDR Display

  Resolution:    3024 x 1964 Retina

  Mirror:                 Off

  Online:               Yes

  Automatically Adjust Brightness:    Yes

  Connection Type:       Internal