Gmail DKIM Authentication Issue

Hi Guys. Your help is much more appreciated.

I do have the following TxT record. All outgoing mail from my server passed with SPF and DMARC and shown in email header, but DKIM is not authenticated and now shown at all in email header. Any idea?

@
v=spf1 ip4:xxx a mx include:_spf.google.com ~all

@
v=DMARC1; [email protected]; p=quarantine; pct=90; sp=none

google._domainkey
v=DKIM1;k=rsa;p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyGurY1KuseqpaVePd85j9peBYpRT8x51cV/hBQDlfRrcxOIDhHPhtXjCKWb/P2bqDJ1EcwIpQhqxS7wGd8GFnJ6f+BhiLb/MYJHle2bDO4MsdgbMFevZi3bmUZCqFYvssCwp7hhgYdG3rdZHiP/8C1AaNCP7IFI63isiSjHMO50zmMVFepOIqojGtif7TQTbgdxbDVZd4ojbaLgQt8xOrHa049YCHBjPr/BtS7eB71xgqbJ0HRh1hbgzfgLGD0bcXQcr8fmsb8TREh9Cj/8GK71qJDKYoFDbg9vm2xS05U4slscm6B3TYnzbLqkj3x0wsyQ0saVpBfD3TjSu/elz3wIDAQAB

In Gmail itself, you can check DKIM by clicking the tripple dots on a message then clicking “show original”:
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For GSuite specifically, you should make sure you have already clicked ‘start authentication’ under Apps > G Suite > Settings for Gmail > Authenticate email

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