The Edgbaston Test will be part of India's white-ball tour of England. The match will be held from 1 July.
There were fears the Ashes would be cancelled after months of concern over tough Covid-19 quarantine guidelines which England's players and their families will have to follow in Australia.
Watmore, 63, has a reached a "mutual agreement" with the board to leave his role following the end of the domestic season after just over a year in the role.
The ECB said the priority was to ensure the tour can take place "with conditions for players and management to perform at their best."
Joe Root's team are due to play a five-Test series starting in Brisbane on 8 December, with further matches in Adelaide, Melbourne, Sydney and Perth.
Ahmed, who has a foot in both camps after serving as England's spin-bowling coach in 2009-2015, voiced his frustration to AFP after English cricket chiefs controversially cancelled tours for their men's and women's teams next month to cricket-crazy Pakistan.
Moeen has scored 2,914 runs in 64 Tests at an average of 28.29 with five centuries and picked up 195 wickets with his off-spin bowling at an average of 36.66.
New Zealand abandoned and England pulled out of scheduled assignments in Pakistan in quick succession citing security concerns. England also gave players' mental health as a reason for the withdrawal.
The ECB on Monday withdrew its men's and women's teams from the tour of Pakistan, citing increased concerns about travelling to the region.
“I am severely disappointed in England’s withdrawal but it was expected because this western bloc gets united unfortunately and tries to back each other,” Ramiz said in a video message.
"The ECB have received a threatening email relating to NZC. Although this did not specifically reference the White Ferns, it was treated seriously, investigated, and deemed not credible," the governing body said in a statement.
The England and Wales Cricket Board (ECB) are still adamant and have not thought about postponement which has irked the senior players and support staff.
The England and Wales Cricket Board (ECB) has written to the ICC seeking a Dispute Resolution Committee (DRC) verdict on the fate of the cancelled match that was to be played at Old Trafford, Manchester. The ICC is yet to comment on the matter.
The dramatic last-minute cancellation of the deciding fifth Test at Old Trafford has heightened the tension already surrounding the upcoming Ashes series.
It is understood that ECB will press for a forfeiture of the fifth Test which would allow them to claim the compensation from the insurance company.
The fifth Test was cancelled after a COVID-19 outbreak in the Indian camp which made visiting players reluctant to play fearing a positive result might lead to 10-day isolation and scheduling nightmare of Indian Premier League.
India vs England: BCCI chief Sourav Ganguly unsure 5th Test will go ahead after junior physio Yogesh Parmar tests positive
The players have been told to remain in their respective rooms as RT-PCR testing is being carried out. Besides Shastri and Patel, fielding coach R Sridhar and Arun are also isolating in London.
ECB chair Ian Watmore said the executives are being rewarded for their good work amid the COVID-19 pandemic.
India vs England: Hosts drop opener Dom Sibley after poor performances, recall Dawid Malan for third Test
India are 1-0 up in the five-match series after a 151-run win in the second Test at Lord's where Sibley made scores of 11 and nought as his average dipped to 19.77 in 10 Tests this year.
ECB says player welfare ‘paramount’ while ensuring availability of England’s best options for packed Ashes schedule
In a joint statement with the Professional Cricketers’ Association (PCA) on Friday, the governing bodies reiterated their desire for the five-Test series to be played at the highest possible standard. Meetings with Cricket Australia (CA) are set to occur in the coming weeks.