diff --git a/apps/frontend/src/pages/[type]/[id]/settings/members.vue b/apps/frontend/src/pages/[type]/[id]/settings/members.vue
index 28975c47f..78c781abc 100644
--- a/apps/frontend/src/pages/[type]/[id]/settings/members.vue
+++ b/apps/frontend/src/pages/[type]/[id]/settings/members.vue
@@ -499,9 +499,26 @@
 					</div>
 				</template>
 				<div class="input-group">
+					<!--
+					if we save changes and update an org member which:
+					- is not currently overridden (!allOrgMembers[index].oldOverride)
+					- and we're not changing them to be overridden (!allOrgMembers[index].override)
+
+					then we end up editing an org member which, in the backend, doesn't exist.
+					the api doesn't let us do that, we can only do:
+					- !override -> override: POST member
+					- override -> !override: DELETE member
+					- override -> override: PATCH member
+					- !override -> !override: do nothing
+
+					we don't allow clicking the button in that last case.
+					-->
 					<button
 						class="iconified-button brand-button"
-						:disabled="(currentMember?.permissions & EDIT_MEMBER) !== EDIT_MEMBER"
+						:disabled="
+							(currentMember?.permissions & EDIT_MEMBER) !== EDIT_MEMBER ||
+							(!allOrgMembers[index].oldOverride && !allOrgMembers[index].override)
+						"
 						@click="updateOrgMember(index)"
 					>
 						<SaveIcon />
@@ -565,22 +582,21 @@ function initMembers() {
 
 	const selectedMembersForOrg = orgMembers.map((partialOrgMember) => {
 		const foundMember = allMembers.value.find((tM) => tM.user.id === partialOrgMember.user.id)
-		const returnVal = foundMember ?? partialOrgMember
 
-		// If replacing a partial with a full member, we need to mark as such.
-		returnVal.override = !!foundMember
-		returnVal.oldOverride = !!foundMember
-
-		returnVal.is_owner = partialOrgMember.is_owner
-
-		return returnVal
+		const base = foundMember ?? partialOrgMember
+		return {
+			...base,
+			override: !!foundMember,
+			oldOverride: !!foundMember,
+			is_owner: partialOrgMember.is_owner,
+		}
 	})
 
 	allOrgMembers.value = selectedMembersForOrg
 
-	allTeamMembers.value = allMembers.value.filter(
-		(x) => !selectedMembersForOrg.some((y) => y.user.id === x.user.id),
-	)
+	allTeamMembers.value = allMembers.value
+		.filter((x) => !selectedMembersForOrg.some((y) => y.user.id === x.user.id))
+		.map((x) => ({ ...x }))
 }
 
 watch([allMembers, organization, project, currentMember], initMembers)
@@ -688,6 +704,11 @@ const removeTeamMember = async (index) => {
 			},
 		)
 		await updateMembers()
+		addNotification({
+			title: 'Member removed',
+			text: "Your project's member has been removed.",
+			type: 'success',
+		})
 	} catch (err) {
 		addNotification({
 			title: 'An error occurred',
@@ -748,6 +769,11 @@ const transferOwnership = async (index) => {
 				user_id: allTeamMembers.value[index].user.id,
 			},
 		})
+		addNotification({
+			title: 'Member ownership transferred',
+			text: `${allTeamMembers.value[index].user.username} is now the owner of the project.`,
+			type: 'success',
+		})
 		await updateMembers()
 	} catch (err) {
 		addNotification({
@@ -795,6 +821,11 @@ async function updateOrgMember(index) {
 			)
 		}
 		await updateMembers()
+		addNotification({
+			title: 'Member(s) updated',
+			text: "Your project's member(s) has been updated.",
+			type: 'success',
+		})
 	} catch (err) {
 		addNotification({
 			title: 'An error occurred',
diff --git a/apps/labrinth/src/routes/v3/teams.rs b/apps/labrinth/src/routes/v3/teams.rs
index 141965d16..489d77128 100644
--- a/apps/labrinth/src/routes/v3/teams.rs
+++ b/apps/labrinth/src/routes/v3/teams.rs
@@ -14,6 +14,7 @@ use crate::queue::session::AuthQueue;
 use crate::routes::ApiError;
 use actix_web::{HttpRequest, HttpResponse, web};
 use ariadne::ids::UserId;
+use eyre::eyre;
 use rust_decimal::Decimal;
 use serde::{Deserialize, Serialize};
 
@@ -708,10 +709,10 @@ pub async fn edit_team_member(
         DBTeamMember::get_from_user_id_pending(id, user_id, &**pool)
             .await?
             .ok_or_else(|| {
-                ApiError::CustomAuthentication(
-                    "You don't have permission to edit members of this team"
-                        .to_string(),
-                )
+                ApiError::Request(eyre!(
+                    "This member does not exist in this team - \
+                    the member must first be created via `POST`"
+                ))
             })?;
 
     let mut transaction = pool.begin().await?;