diff --git a/src/internal/m365/collection/groups/handler.go b/src/internal/m365/collection/groups/handler.go
index d4e963d16..bebdc4d98 100644
--- a/src/internal/m365/collection/groups/handler.go
+++ b/src/internal/m365/collection/groups/handler.go
@@ -11,7 +11,7 @@ import (
 
 type BackupMessagesHandler interface {
 	GetMessage(ctx context.Context, teamID, channelID, itemID string) (models.ChatMessageable, error)
-	NewMessagePager(teamID, channelID string) api.MessageItemDeltaEnumerator
+	NewMessagePager(teamID, channelID string) api.ChannelMessageDeltaEnumerator
 	GetChannel(ctx context.Context, teamID, channelID string) (models.Channelable, error)
 	GetReply(ctx context.Context, teamID, channelID, messageID string) (serialization.Parsable, error)
 }
diff --git a/src/internal/tester/tconfig/config.go b/src/internal/tester/tconfig/config.go
index 387caff08..eb001fda9 100644
--- a/src/internal/tester/tconfig/config.go
+++ b/src/internal/tester/tconfig/config.go
@@ -28,7 +28,6 @@ const (
 	TestCfgSiteURL          = "m365siteurl"
 	TestCfgTeamID           = "m365teamid"
 	TestCfgGroupID          = "m365groupid"
-	TestCfgChannelID        = "m365channelid"
 	TestCfgUserID           = "m365userid"
 	TestCfgSecondaryUserID  = "secondarym365userid"
 	TestCfgSecondaryGroupID = "secondarym365groupid"
@@ -169,12 +168,6 @@ func ReadTestConfig() (map[string]string, error) {
 		os.Getenv(EnvCorsoM365TestGroupID),
 		vpr.GetString(TestCfgGroupID),
 		"6f24b40d-b13d-4752-980f-f5fb9fba7aa0")
-	fallbackTo(
-		testEnv,
-		TestCfgChannelID,
-		os.Getenv(EnvCorsoM365TestChannelID),
-		vpr.GetString(TestCfgChannelID),
-		"19:nY6QHZ3hnHJ6ylarBxPjCOLRJNvrL3oKI5iW15QxTPA1@thread.tacv2")
 	fallbackTo(
 		testEnv,
 		TestCfgSiteURL,
diff --git a/src/internal/tester/tconfig/protected_resources.go b/src/internal/tester/tconfig/protected_resources.go
index 6a0a46783..26c0187ac 100644
--- a/src/internal/tester/tconfig/protected_resources.go
+++ b/src/internal/tester/tconfig/protected_resources.go
@@ -246,14 +246,3 @@ func M365GroupID(t *testing.T) string {
 
 	return strings.ToLower(cfg[TestCfgTeamID])
 }
-
-// M365ChannelID returns a channelID string representing the m365TeamsID described
-// by either the env var CORSO_M365_TEST_CHANNEL_ID, the corso_test.toml config
-// file or the default value (in that order of priority).  The default is a
-// last-attempt fallback that will only work on alcion's testing org.
-func M365ChannelID(t *testing.T) string {
-	cfg, err := ReadTestConfig()
-	require.NoError(t, err, "retrieving m365 channel id from test configuration: %+v", clues.ToCore(err))
-
-	return cfg[TestCfgChannelID]
-}