I encountered an error ‘Error during service call, cannot get the state of the model’
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Cam Salzberger on 18 Jan 2022
Since that seems to have resolved the issue, copying my comment into an answer:
Make sure to get a new VM as directed by this example any time you upgrade your release. ROS Toolbox is using Melodic for communication R2020b-R2022a, so if you're using the same VM as you did with R2019b (or before), there may be issues communicating.