If the manager says that, you can say, "But, in that case you've already agreed to the accommodation and therefore a sudden call into the office would be unlikely and irregular. An emergency situation can be handled by wearing a mask and social distancing since it would be of short duration. Can you think of a situation in which that wouldn't be the case?"My manager on an off the record call told me full remote isn't good enough of an argument because I could feasibly be called into the office for something (which hasn't happened in the past 20 months). Just ridiculous.