If I understand you correctly then you are saying that the failover in your HSRP group is actually not working properly: when you disconnect the active router, the standby router does not seem to acquire the active role and does not provide the connectivity to outside networks. Is that correct?
I think we should start verifying the problem by looking at the HSRP router configuration. If possible please post the following outputs:
Configurations of the HSRP-enabled interfaces on both routers
Output of the show standby brief and show standby on both routers when both routers are on and connected
Output of the show standby brief and show standby on both routers when the active router is disconnected
Let's focus on the switch only after we are sure that the HSRP configuration is correct and working as expected.
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