I can’t say Ive necessarily found operational managers any harder to get hold of since covid kicked off. As drivers our managers tend to do office hours, with someone on call 24/7, and almost all communication when out and about would be by phone anyway. Communication on the railway is pretty poor generally - but that was the case before covid.
It’s a shame more frontline staff, especially TMs, don’t seem to be aware of websites like real-time trains which can be extremely useful and make the job easier! When stopped at reds it’s frustrating to often hear guards making exactly the same announcements as I used to when I was a DOO driver ie “we are being held at a red signal” and nothing further. Unlike me in the driving cab they’re in the position of being able to use a mobile device and simply checking RTT would usually show why we are being held and provide some proper insight to the situation. Waiting for me to do that via the signaller and pass on will take much longer, especially if there’s been a major incident involving many trains.
Equally when waiting to relieve a train I’ve several times been able to use it to realise when the train is going to be brought into a different platform than advertised and start to make my way over there before it is officially announced. Why more don’t do this (and some will still use things like national rail enquiries to find where their train is) is beyond me!
*OTT is as you say often even more useful for the live track diagrams - I use both that and RTT depending on situation.