Hi @Flórida da Graça Botelho Araújo ,
- Make sure you have activated “Open Documents in Client Applications by Default” Feature.
Go to Site Settings >> Site Collection Features, click on the “Activate” button next to the “Open Documents in Client Applications by Default” feature

- Please switch the browser to check if the same problem exists or enable the IE mode of the Edge browser.
- Compare the versions of the two users' office clients and update it.
- Try disabling Office Web Apps for SharePoint environment, go to SharePoint WFE or Application Server and open SharePoint Admin Shell. Run the following PowerShell command to disconnect the Office Web Apps farm from SharePoint by removing the binding. See if Excel files will be opened by default on the client side.
Remove-SPWOPIBinding -all $true
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) has read access and only the "open in browser" option appears