Doesn't work with MFA in XRM Toolbox
Just thought I should let you know that the Ribbon workbench does not work when connecting using MFA in XRM Toolbox.
This is the error you get:
Unable to cast object of type 'Microsoft.Xrm.Sdk.WebServiceClient.OrganizationWebProxyClient' to type 'Microsoft.Xrm.Sdk.Client.OrganizationServiceProxy'.
Many tools in the toolbox do work with MFA. You can get round this by connecting with an App Password for your MFA enabled account.

4 comments
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bruteforce commented
Someone please check on this as we get the same issue.
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362335821 commented
my error as below
Error
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An error occured when trying to display this plugin: Unable to cast object of type 'Microsoft.Xrm.Tooling.Connector.CrmServiceClient' to type 'Microsoft.Xrm.Sdk.Client.OrganizationServiceProxy'.
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OK
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Kimmo Koski commented
I'm having this issue as well
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Justin Reading commented
Confirmed, we are experiencing this issue as well.