cron job for Let’s Encrypt (Certbot) renewal shouldn’t be working

I’ve arrange a cron job to resume twice each day

0 15 * * * /usr/bin/certbot renew –quiet
0 0 * * * /usr/bin/certbot renew –quiet

However my ssl stil get expired at present.I have to go the the command line to run
/usr/bin/certbot renew
manually.Is there something with my crontab?

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