Help with Vlan creation.

Having some real problems with this set up/end goal.

Work has some areas that are pretty messy IP wise. So we want to clean them up with subnetting each area.

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On the parent switch, I see this when showing vlan brief.

336 VLAN0336 active Gi1/0/5

so to me it seems like the Vlan is active and ready to roll. port 5 is the port I configured to access the vlan. So that checks out for me. If I run show inter vlan 336 I see what looks to be all good. The address is set and its reading up.

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When I go to change the IP on one of the end devices im unable to ping the device. Is there a chance the IP is being used somewhere else and im running into that?

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Any help would be awesome! Thanks!