LVM issue - unable to extend metadata

I'm having a problem with LVM under Debian 10 server. I want to extend the metadata size for satassd/data (see below). Using lvextend --poolmetadatasize +1G satassd/data" gives an error saying Insufficient Free Space". Looking at the results of lvs, vgs and pvs (shown below), I see that the volume group (satassd) and physical disk have no free space remaining. But, if I add up all the Lsizes of the LVs on satassd, I don't see nearly enough usage to fill the 1.82T capacity. It looks like there should be plenty of space available.

To do the math, there are twelve 50G LVs and a 1.82T data LV that is 8.7% filled. This gives (roughly) 760G being used. But the whole volume is 1.82T, so there should be free space available. Why does it say that it's full?

I'm no expert on LVM (nor Linux for that matter) and I'm puzzled as to what's going on and how to fix it. Any advice would be appreciated.

Thanks,
Eric

Code:root@pve:~# lvs -a
LV VG Attr LSize Pool Origin Data% Meta% Move
data pve twi-aotz-- <338.36g 54.88 3.64
[data_tdata] pve Twi-ao---- <338.36g
[data_tmeta] pve ewi-ao---- 3.45g
[lvol0_pmspare] pve ewi------- 3.45g
root pve -wi-ao---- 96.00g
snap_vm-102-disk-0_OMV5_c pve Vri---tz-k 50.00g data vm-102-disk-0
snap_vm-102-disk-0_OMV5_initial pve Vri---tz-k 50.00g data vm-102-disk-0
snap_vm-102-disk-0_OMV_3_24_21 pve Vri---tz-k 50.00g data vm-102-disk-0
snap_vm-102-disk-0_OMV_d pve Vri---tz-k 50.00g data vm-102-disk-0
snap_vm-107-disk-0_PlayOn pve Vri---tz-k 50.00g data vm-107-disk-0
snap_vm-107-disk-0_PlayOn_1 pve Vri---tz-k 50.00g data vm-107-disk-0
snap_vm-107-disk-0_PlayOn_3_24_21 pve Vri---tz-k 50.00g data vm-107-disk-0
snap_vm-107-disk-0_PlayOn_b pve Vri---tz-k 50.00g data vm-107-disk-0
snap_vm-109-disk-0_Plex3Deb pve Vri---tz-k 50.00g data
snap_vm-109-disk-0_Plex3Deb_b pve Vri---tz-k 50.00g data
snap_vm-109-disk-0_Plex_01 pve Vri---tz-k 50.00g data vm-109-disk-0
snap_vm-109-disk-0_Plex_02 pve Vri---tz-k 50.00g data vm-109-disk-0
snap_vm-109-disk-0_Plex_03 pve Vri---tz-k 50.00g data vm-109-disk-0
snap_vm-109-disk-0_Plex_3_24_21 pve Vri---tz-k 50.00g data vm-109-disk-0
snap_vm-109-disk-0_Plex_p pve Vri---tz-k 50.00g data vm-109-disk-0
swap pve -wi-ao---- 8.00g
vm-102-disk-0 pve Vwi-aotz-- 50.00g data 12.84
vm-107-disk-0 pve Vwi-aotz-- 50.00g data 72.77
vm-109-disk-0 pve Vwi-aotz-- 50.00g data 90.49
base-111-disk-0 satassd Vri---tz-k 50.00g data
base-112-disk-0 satassd Vri---tz-k 50.00g data
data satassd twi-aotz-- <1.82t 8.70 100.00
[data_tdata] satassd Twi-ao---- <1.82t
[data_tmeta] satassd ewi-ao---- 100.00m
[lvol0_pmspare] satassd ewi------- 100.00m
snap_vm-101-disk-0_Mint3_29_21 satassd Vri---tz-k 50.00g data vm-101-disk-0
snap_vm-104-disk-0_Anaconda3_21_21 satassd Vri---tz-k 50.00g data vm-104-disk-0
snap_vm-106-disk-0_Ubuntu3_21_21 satassd Vri---tz-k 50.00g data vm-106-disk-0
snap_vm-113-disk-0_ZM3_21_21 satassd Vri---tz-k 50.00g data vm-113-disk-0
vm-100-disk-0 satassd Vwi-a-tz-- 50.00g data 21.96
vm-101-disk-0 satassd Vwi-a-tz-- 50.00g data 43.96
vm-104-disk-0 satassd Vwi-a-tz-- 50.00g data 44.77
vm-106-disk-0 satassd Vwi-a-tz-- 50.00g data 20.60
vm-113-disk-0 satassd Vwi-a-tz-- 50.00g data 98.47

root@pve:~# vgs
VG #PV #LV #SN Attr VSize VFree
pve 1 21 0 wz--n- <465.26g <16.00g
satassd 1 12 0 wz--n- <1.82t 0

root@pve:~# pvs
PV VG Fmt Attr PSize PFree
/dev/nvme0n1p3 pve lvm2 a-- <465.26g <16.00g
/dev/sdc1 satassd lvm2 a-- <1.82t 0