DHCP Service is not offering IPs all of a sudden

Question

Dear Community,

We have DHCP Service installed on windows server 2019 Server based vm which is also Domain Controller. We have 2 domain controllers here, ho-domain & ho1-domain. Everything was working fine until we started facing Issue with the DHCP Yesterday when it couldn't offer IP To newly procured HP Laptops yesterdy. Afterwards, It also Started happening on all the devices, that no old device was being handed over IP by DHCP.

Below are the steps that we performed. But the DHCP is still up and has showed no abnormal events either and did not crash as well. The only thing it did was to not handover IPs to the Client Machines.

1. We rebooted the Domain Controller ho-domain (which had dhcp role)
2. We restored DHCP Service with 1 days old DHCP Backup on the ho-domain machine.
3. We then thought that the Server might be problematic so we Unauthorized the DHCP role from ho-domain.
4. Next, we restored the dhcp backup on second domain controller ho1-domain and authorized it, it was up though but the issue was still the same. It was not handing over IPs.
5. As our domain controllers are Virtual machines, so we rebooted the Base Machines as well on which these vms are created
6. Then we isolated our network and connected a client device directly to the base Machine of ho1-domain VM, so Incase any Switch or another

intermedite Device was causing Issue it would be bypassed, but it still not resolved the Issue

7. We then Installed the DHCP Role on Third Machine which was a separate physical Machine and since it had Windows Server 2012 in it. We couldn't restore it through DHCP Backup and infact we manually defined scope and everything. Also, it only did few lease.
8. It was all good. But once we tried to manually reseverve the IPs which weere not yet leased , it started causing Issue and not only all reservations became inactive, It sort of stopped leasing IPS as well.
9. Then we installed DHCP Role yet on an other Physical machine and this time we didnot resrve any IP and the DHCP serevr is sort of provong leases. But we didnot manually added reseervations against our mac devices as we had a fear that this third time configured DHCP would also turn weird and stop leasing.

Now I want your help, As I dont see any Major Event in DHCP EventLogs and I dont understand how to resolve this Issue. Its really frustrating. Please help me out in this situation.

Thanks.