Extending virtual device and then fdisk now gives unknown physical volume on centos 7

I'm trying to extend space on sdb. It was 800G before, I've added 1TB to it, making it 1.8T total (extended the disk from VM's Vmware settings).

1. Extended the 800G disk with 1TB more making it 1.8TB

2. Restarted the server and did fdisk -l; which showed /dev/sdb to be now 1.8TB

3. Did fdisk /dev/sdb and created a new partition /dev/sdb1

4. Tried creating the new partition with # pvcreate /dev/sdb1 and it came back with an error "WARNING: Device for PV j78ah-bnusb-uc869 not found or rejected by a filter. | Couldn't find device with uuid PV j78ah-bnusb-uc869. | WARNING: Couldn't find all devices for LV vg0/00 while checking used and assumed devices."

5. And this is what I see under # pvs

PV VG Fmt Attr PSize PFree

/dev/sda3 vg0 lvm2 a-- <249.00g 0

/dev/sdc vg0 lvm2 a-- 1.95t 0

[unknown] vg0 lvm2 a-m <800.00g 0

6. The [unknown] used to be /dev/sdb. It was previously 800G, added 1T more, but it still is 800G under pvs

7. I've tried unmounting /opt and running #pvcreate /dev/sdb1 but the same error comes up. Any suggestions? Thank you.

$ lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

sda 8:0 0 9T 0 disk

├─sda1 8:1 0 1M 0 part

├─sda2 8:2 0 1G 0 part /boot

└─sda3 8:3 0 249G 0 part

├─vg0-root 253:0 0 35G 0 lvm /

├─vg0-swap 253:1 0 3.9G 0 lvm [SWAP]

├─vg0-01 253:2 0 5G 0 lvm /var/log

└─vg0-00 253:3 0 3T 0 lvm /opt

sdb 8:16 0 1.8T 0 disk

├─sdb1 8:17 0 1.8T 0 part

└─vg0-00 253:3 0 3T 0 lvm /opt

sdc 8:32 0 2T 0 disk

└─vg0-00 253:3 0 3T 0 lvm /opt