Okay... I figured out what my issue was.
I had disabled the non-enterprise repositories. I thought I needed to do that since I have licenses on both nodes for the enterprise repo's. (I would appreciate any comments on this..)
Even though I had enabled the non-enterprise repo's, I was still unable to install the qdevice. But apparently I needed to run "apt update" after re-enabling the non-enterprise repo's. After doing that, I was able to install the corosync-qdevice package and then successfully setup my qdevice.
I'll chock this up to being a complete n00b with Linux...
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root@proxmox02:~# pvecm status
Cluster information
-------------------
Name: pve-cluster00
Config Version: 3
Transport: knet
Secure auth: on
Quorum information
------------------
Date: Sat Aug 16 11:07:25 2025
Quorum provider: corosync_votequorum
Nodes: 2
Node ID: 0x00000002
Ring ID: 1.9
Quorate: Yes
Votequorum information
----------------------
Expected votes: 3
Highest expected: 3
Total votes: 3
Quorum: 2
Flags: Quorate Qdevice
Membership information
----------------------
Nodeid Votes Qdevice Name
0x00000001 1 A,V,NMW 10.255.3.1
0x00000002 1 A,V,NMW 10.255.3.2 (local)
0x00000000 1 Qdevice
root@proxmox02:~# pvecm nodes
Membership information
----------------------
Nodeid Votes Qdevice Name
1 1 A,V,NMW proxmox01
2 1 A,V,NMW proxmox02 (local)
0 1 Qdevice