x670-x440 Vrrp change master to backup, not routing

[Network_Operat1]

We have 2 stacks both stacks are 1 x460 and 1x440 and an ISC connecting. When we try to fail over to the backup, the backup takes over as master but routing of the layer 3 vlans is not happening. FW Version we are using is 21.1.5.2

Any help or ideas much will be appreciated.

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[davidj_cogliane]

If the stack is 1 460 and 1 440 the backup must be the 440. The 440 does not have the routing abilities the 460 does.

Unless I am missing something this is design issue and the 440 should be replaced with a second 460.