How to publish join code to discord server

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I tried to make hook to publish the join code to our friends discord server but iam getting the error
supervisord: valheim-server curl: (22) The requested URL returned error: 400

My env variables are

ON_VALHEIM_LOG_FILTER_CONTAINS_code = { read l; l=${l//*Session "server name" registered with join code /}; l=${l// :*/}; msg="Join code is $l"; curl -sfSL -X POST -H "Content-Type: application/json" -d "{\"username\":\"Valheim\",\"content\":\"$msg\"}" "$DISCORD_WEBHOOK"; }

VALHEIM_LOG_FILTER_CONTAINS_code=Session "server name" registered with join code

LOG

118 main.go:241] Running hook "{ read l; l=${l//*Session \"server name\" registered with join code /}; l=${l// :*/}; msg=\"Join code is $l\"; curl -sfSL -X POST -H \"Content-Type: application/json\" -d \"{\\\"username\\\":\\\"Valheim\\\",\\\"content\\\":\\\"$msg\\\"}\" \"$DISCORD_WEBHOOK\"; }" for "06/24/2024 14:52:09: Session \"server name\" registered with join code xxxxxx"
Jun 24 14:52:10 supervisord: valheim-server curl: (22) The requested URL returned error: 400