Magento2 : user define customer attribute not save value while create / save from admin

looks like the issue was due to the fact your attributes are not assigned to the customer attribute set.

the following code is needed in your install: I added full code for you at https://bitbucket.org/magstaging/newcustomerattribute

$eavSetup->addAttributeToSet(
            CustomerMetadataInterface::ENTITY_TYPE_CUSTOMER,
            CustomerMetadataInterface::ATTRIBUTE_SET_ID_CUSTOMER,
            null,
            $attributeCode);