Support error code for email / phone adding unsupported

https://github.com/matrix-org/matrix-spec-proposals/pull/4178

src/AddThreepid.ts

@@ -86,6 +86,8 @@ export default class AddThreepid {
         } catch (err) {
             if (err instanceof MatrixError && err.errcode === "M_THREEPID_IN_USE") {
                 throw new UserFriendlyError("settings|general|email_address_in_use", { cause: err });
+            } else if (err instanceof MatrixError && err.errcode === "M_THREEPID_MEDIUM_NOT_SUPPORTED") {
+                throw new UserFriendlyError("settings|general|email_adding_unsupported_by_hs", { cause: err });
             }
             // Otherwise, just blurt out the same error
             throw err;
@@ -128,6 +130,8 @@ export default class AddThreepid {
      * @param {string} phoneCountry The ISO 2 letter code of the country to resolve phoneNumber in
      * @param {string} phoneNumber The national or international formatted phone number to add
      * @return {Promise} Resolves when the text message has been sent. Then call haveMsisdnToken().
+     *
+     * @throws {UserFriendlyError} An appropriate user-friendly error if the verification code could not be sent.
      */
     public async addMsisdn(phoneCountry: string, phoneNumber: string): Promise<IRequestMsisdnTokenResponse> {
         try {
@@ -143,6 +147,8 @@ export default class AddThreepid {
         } catch (err) {
             if (err instanceof MatrixError && err.errcode === "M_THREEPID_IN_USE") {
                 throw new UserFriendlyError("settings|general|msisdn_in_use", { cause: err });
+            } else if (err instanceof MatrixError && err.errcode === "M_THREEPID_MEDIUM_NOT_SUPPORTED") {
+                throw new UserFriendlyError("settings|general|msisdn_adding_unsupported_by_hs", { cause: err });
             }
             // Otherwise, just blurt out the same error
             throw err;

src/i18n/strings/en_EN.json

@@ -2508,6 +2508,7 @@
             "discovery_needs_terms_title": "Let people find you",
             "display_name": "Display Name",
             "display_name_error": "Unable to set display name",
+            "email_adding_unsupported_by_hs": "This homeserver does not support adding email addresses to your account.",
             "email_address_in_use": "This email address is already in use",
             "email_address_label": "Email Address",
             "email_not_verified": "Your email address hasn't been verified yet",
@@ -2533,6 +2534,7 @@
             "identity_server_no_token": "No identity access token found",
             "identity_server_not_set": "Identity server not set",
             "language_section": "Language",
+            "msisdn_adding_unsupported_by_hs": "This homeserver does not support adding phone numbers to your account.",
             "msisdn_in_use": "This phone number is already in use",
             "msisdn_label": "Phone Number",
             "msisdn_verification_field_label": "Verification code",