Hi
Can you verify the native vlan status? are you using the vlan 1 as native or other vlan?
show vlan
also check this link:
https://supportforums.cisco.com/discussion/13124876/3850-trunking
bug CSCul30426
Conditions:
This defect is seen when trying to build a port-channel between a 3850 and any other switch with the following conditions:
1. The native vlan is in the suspended state
or
2. The native vlan is not present in the vlan database.
Workaround:
Once you created the layer two vlan or change it to an "active" state, the port-channel will form as expected.
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