Hi @Thomas Gibbons
Thank you for reaching Microsoft Q&A!
Apologies for the delay response.
Currently there is no option to use two different profiles from two different tenants on the same PC.
Because the device is registered with one single tenant.
As a workaround Use Multiple Browsers Profiles which allow you to create separate profiles. Each profile can be signed into a different tenant.
Alternatively, set up a virtual machine and log into another tenant.
Hope this helps. Do let us know if you any further queries by responding in the comments section.
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