Thank you for your response!
We have performed the following procedures and we were able to download the latest Microsoft Edge Stable Channel (version 131.0.2903.86) from the WSUS server.
- Unchecked "Microsoft Edge", "Updates" and "Upgrades" in [Options]>[Products and Classifications] of WSUS Server.
- Declined all Microsoft Edge updates.
- Performed synchronization.
- Performed WSUS Server cleanup.
- Put check in "Microsoft Edge", "Updates" and "Upgrades" in [Options]>[Products and Classifications] of WSUS Server.
- Performed synchronization. -> The Microsoft Edge Stable Channel (version 131.0.2903.86) update was downloaded successfully.
We think the synchronization state of the WSUS server was damaged somehow because we performed synchronization of 5 WSUS servers all at once, that's why the latest version 131.0.2903.86 was not downloaded before. So, by performing the above procedures, the WSUS server synchronization state was restored correctly.
As a result, the latest version 131.0.2903.86 was downloaded already.