diff --git a/src/gam/gapi/cloudidentity/userinvitations.py b/src/gam/gapi/cloudidentity/userinvitations.py
index 2ca132c6..db121c52 100644
--- a/src/gam/gapi/cloudidentity/userinvitations.py
+++ b/src/gam/gapi/cloudidentity/userinvitations.py
@@ -12,8 +12,11 @@ from gam.gapi import errors as gapi_errors
 from gam.gapi import cloudidentity as gapi_cloudidentity
 
 def _get_customerid():
-    ''' returns customer in format needed for this API'''
-    return f'customers/{GC_Values[GC_CUSTOMER_ID]}'
+    ''' returns customer in "customers/(C){customer_id}' format needed for this API'''
+    customer = GC_Values[GC_CUSTOMER_ID]
+    if customer != MY_CUSTOMER and customer[0] != 'C':
+        customer = 'C' + customer
+    return f'customers/{customer}'
 
 def _reduce_name(name):
     ''' converts long name into email address'''
diff --git a/src/gam/gapi/directory/printers.py b/src/gam/gapi/directory/printers.py
index 856cbbce..ae887c9c 100644
--- a/src/gam/gapi/directory/printers.py
+++ b/src/gam/gapi/directory/printers.py
@@ -10,8 +10,10 @@ from gam.gapi.directory import orgunits as gapi_directory_orgunits
 
 
 def _get_customerid():
-    ''' returns customer in format needed for this API'''
+    ''' returns customer in "customers/C{customer}" format needed for this API'''
     customer = GC_Values[GC_CUSTOMER_ID]
+    if customer != MY_CUSTOMER and customer[0] != 'C':
+        customer = 'C' + customer
     return f'customers/{customer}'
 
 def _get_printer_attributes(i, cdapi=None):