Hello vvalenzuela,
Looks like expected behaviour:
VMware Product Interoperability Matrices
How much space on the local datastores and how big is the largest vmdk? You could temporarily move VMs there then SvMotion to vsanDatastore.
If these local datastores are too small and this is a new vSAN cluster, you could consider using some of the vSAN drives to extend the VMFS local datastores temporarily (Yes I know, far from ideal but options nonetheless).
Alternatively use something else like backup-restore solutions such as Veeam.
Bob