Multiple Remote 40.0 on same H3 receiver?

Currently have 2 remotes paired with my H3 Hopper. One is a 40.0 and one is 52.0. Is there a way to add a second 40.0 for a total of 3 remotes on the same H3 Hopper? Tried last night but the "pairing" button on the remote would not start the pairing process.

thanks!