The Windsor Castle Order of the Garter march will include Royal Family members on Monday.
A royal pundit said Prince Andrew is "probably very depressed" at missing the Order of the Garter procession today.
Majesty Magazine Editor-in-Chief Ingrid Seward called the disgraced royal "completely lost" and "unable to do anything".
She told GB News: "Especially seeing all his family riding at the trooping on Saturday when only a few years before he was doing the same thing".
King Charles and the Royal Family attend the Windsor Castle procession and worship honoring the Knights of the Garter.
The Sovereign personally selects honorees to honor persons who have held public office, contributed to national life, or served the Sovereign.
A palace insider said the last-minute decision to ban Andrew from last year's celebrations was a "family decision".
The Duke of York attended the investiture and lunch but not the procession or service.
After Queen Elizabeth II's death last year, King Charles will celebrate his first Monarchy this year.
After letting his younger brother wear his Garter robes during the Coronation last month, reports suggested the King was softening his attitude on him.