fixed some additional instances of incorrect error message

src/registrar/forms/domain.py

@@ -35,7 +35,10 @@ class DomainAddUserForm(forms.Form):
     email = forms.EmailField(
         label="Email",
         max_length=None,
-        error_messages={"invalid": ("Enter an email address in the required format, like name@example.com.")},
+        error_messages={
+            "invalid": ("Enter an email address in the required format, like name@example.com."),
+            "required": ("Enter an email address in the required format, like name@example.com.")
+        },
         validators=[
             MaxLengthValidator(
                 320,
@@ -461,6 +464,9 @@ class DomainOrgNameAddressForm(forms.ModelForm):
                 message="Enter a 5-digit or 9-digit zip code, like 12345 or 12345-6789.",
             )
         ],
+        error_messages={
+            'required': "Enter a 5-digit or 9-digit zip code, like 12345 or 12345-6789.",
+        }
     )
 
     class Meta:

src/registrar/forms/domain_request_wizard.py

@@ -226,7 +226,10 @@ class SeniorOfficialForm(RegistrarForm):
     email = forms.EmailField(
         label="Email",
         max_length=None,
-        error_messages={"invalid": ("Enter an email address in the required format, like name@example.com.")},
+        error_messages={
+            "invalid": ("Enter an email address in the required format, like name@example.com."),
+            "required": ("Enter an email address in the required format, like name@example.com.")
+        },
         validators=[
             MaxLengthValidator(
                 320,
@@ -604,6 +607,7 @@ class CisaRepresentativeForm(BaseDeletableRegistrarForm):
         required=False,
         error_messages={
             "invalid": ("Enter an email address in the required format, like name@example.com."),
+            "required": ("Enter an email address in the required format, like name@example.com.")
         },
         validators=[
             MaxLengthValidator(

src/registrar/forms/portfolio.py

@@ -20,6 +20,9 @@ class PortfolioOrgAddressForm(forms.ModelForm):
                 message="Enter a 5-digit or 9-digit zip code, like 12345 or 12345-6789.",
             )
         ],
+        error_messages={
+            'required': "Enter a 5-digit or 9-digit zip code, like 12345 or 12345-6789.",
+        }
     )
 
     class Meta: