Well --- I still don't understand it, but solved it. Signed up for VPN. I can understand my workplace blocking SL, in general. However, it seems they blocked just a single sim???? I know that does not make sense, but the pieces fit. I was able to tp to my SL home from my RL home network, but not from work network. I can go everywhere else from work network, but not my home sim. VPN solved it, however. Weird.